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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '915006f3af73facd2f032e51043a1c39e66dddefc63f9a5dd84e95e0d41df0b4' 
  AND token = 'iu8H9qJzRwzrST/9oSmxPRcT/SG7Q8gghSzEeFEnLgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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