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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6181793ca7b49488dbe5595968be634f1fb752d94d9002596549dedc5857e850' 
  AND token = '8MgdoW1OshQRJaYxXSke1gMHW0KT3QV4sr8vIA8HTU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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