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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7342342a5f9aee6ea44eb1fd3d1f1ab4cc1ce07d814ec0790c05230bc04e39a' 
  AND token = 'oOwGxAk9LsE+NiOsPht/ePzoV8nnQDo1obXFVbyeWG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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