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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af29c809a3258f805595232bd94d64c13186a8b1beb89ebac8cbc40d44543424' 
  AND token = 'c898eEcyLqnqoOdj5/O9sjuC0KcjEqZlZ0HAU7weUlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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