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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df2216dbd273230ad850e99dbc1fbca930bf8fe65525341bd1253a7efc2471dd' 
  AND token = 'nna6JsYWnNos9Uyrl0bueshWa3LlB8zX87yuTB4f3Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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