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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '269911b2831544b39fd0c9b1a851e7f39ee69f47f6bda5aca1e2376b210d9b6e' 
  AND token = 'sEsMfwoZssZrqLNXsvj6A867HqlkTH9Msdh7MREZ6Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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