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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57d29f2c73434274dc59cea706779b56b5e13e858e9abc3771a09c3edcbb3592' 
  AND token = 'sfzT/XVLmV1QKrCsZMFaJFfSZ06lF7sovAi3xpUwkM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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