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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc0b6fbf53855d7a495542953cad4b67f90199772a9d243042274b99034af94f' 
  AND token = 'yD4mRlCQLk1O9ACbhFs5ra4krHfheRsK0ED4YOfme5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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