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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e78fd039ee2f695f614ccca2dec77de4b57a9db90617487a1446e0736bb92a56' 
  AND token = '+Ce+XESG6RWoWqDWurGrd3vnVhGuBL9OtZfp5bcRnMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}