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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16b2d098192e6b04e6464dfd0627f3bbd201cd64d2eba1c8c208d70cc734de85' 
  AND token = 'sk73Pp45UTWM6Zk/um6xASn6YRAPxrvWJ8RBags1WhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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