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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '422f57bde95e42c104033581a4a2607ca29ad3a5016a6947dedd2b3c74202e76' 
  AND token = 'kTDb0XLAbf/Ur3I6jUW7BXgN8Y+oMSBHDfOcmuArj6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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