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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e40dcc0eb46b0efc1343ab0be83a95263dd5db4e4d478efcc84815af478c850' 
  AND token = 'OKkh2rU6R7y8AXLIpFJJxHr83Unb4hxt7QMEaAAjapw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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