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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bc2edfa00092ea779bd94fa2e9b3eb1bf6dd955b49f93a58cf9a13eeacc89cb' 
  AND token = 'XP7OV6MYb5CYlpB/Xsq0UID8mjBzT1LsYkPs+ev2U5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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