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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '591abc9919040c581ccee8b35b46a73875cf73cdbeec0881853e4b229e484908' 
  AND token = 'I38PqCnHgNsZVJUNyHuAVnpS8tljM5Rc1pkmDe2D3sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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