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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39e4d8aa508ff2074a90e8999ff7ff78e83356a33287b4272554eec43b049fc2' 
  AND token = 'ZOMn7ucFOkgdz+FG3J+weGiFV+y605TQgr4ykVAwQSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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