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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c2fc92da769eb0417de79cc3d4deb460dd86cca912c6b7ed231a6ec1fd1c6f6' 
  AND token = '1lMp3nMOA52BE0WwS2rYDxhn8eBKhW8m0FBnA4CBILY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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