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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c84d3d79a6dd15f00380d4389d3ae153e061f18cb3f3f2cd373359d1fd5d3583' 
  AND token = 'zSWJWnu2oeHzvbEg8MuFtg890CeHRZM//VfMIOaWnnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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