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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa209567d5800f41a4832c4dd1b8036f55f2cd54a8962e6c9863cda5e1719f0b' 
  AND token = 'rmIrKw9ZBSH4TPj0ZvCz4gEke0tdCVupStA8Uff4nkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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