SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72ec2f47b6f8bdace6e62dbaa4e02983f01ce62d9707db01725e6ca160f29759' 
  AND token = 'Uq3rITYKaAYFoWLmmlGCmBsqh0Jw8GiRePGkJkGTx1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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