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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b035f182f3759dfbb97b50b9e723bfa8ed4c278e887adf49ba9845b453ebed3' 
  AND token = 'dIUVFiJnqS/m22dHySKa7t4ff0KvsarrgOvBmd02Wko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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