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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a5a522dea463c621cee495f8c85d8acab47683ea4f49e2435309df59841eb68' 
  AND token = 'mna5R56wTtzEhsUl9gYF4QGx9S4Wu5ZSBhc6nVIzrV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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