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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2157db2462eda39a94fcaad8264a85c3b1275317568fe6c27fd46cb956537503' 
  AND token = 'ersEiDFfpAjjaV2AjHfjJ0GEacjsTziSnO+nDrabfE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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