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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9154131b1204d915bde97ca0b03c3d1bc7900accff34a78cbe89123b414a6144' 
  AND token = 'c8XXdv7BdML97vK3Nim39u7NepOz1G/XEBcJV7raFqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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