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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cbd189b5163f8c1d7300a20439d1e986aca8c7d6f8649915da57a229ea3b434' 
  AND token = 'Gtq23iPmGlxl5S2gTI0A15NWtyu17cb6AQUlIrmflZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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