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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5bb3d7002204076e49c651def175cee6386b077b82dac969b1886d63759449c' 
  AND token = '1Y+JJD2BOq4eWOkjCSmyJw2Ld4bGBcK8MH2W2QEQYNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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