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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9c83b398c80259e2d23556ee145174bd711b2e3b1f37b08b73e280f5b4dbc51' 
  AND token = 'WMbBKoxpIAkQs50dPXm28Mu3kGoH88yYLjZhgZmcHm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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