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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17d6bd04ab225d654056bc34ccc82bbbc46cfe5e987da2f3fc3a00d6a89c6f07' 
  AND token = 'xCR8M3CQXS28xB/ArxB8ppCh/f0Vu/Xa+FX6xV9nfQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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