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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd2f41c4d1004d6986186be7170e919a7ae614c785446b1422fea1350849ccc8' 
  AND token = 'jVTUxZrphRbes0SUCB4Ro8cgRfhlThw+MDr6XhL0ZeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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