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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '440cc05014e27edd67d3ed8e57e51e663d1df66a8658a5ea3c58d437a0206709' 
  AND token = 'sfRuPUv8eAuybePdAtwXT/97MAyCAgV0jJ5iEZAvtpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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