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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a9cba82b50ca0365ed93efb680fba532415aaeb4fc342771e57b481e8339dce' 
  AND token = 'FxxnZATvqTBUFZnEA33FdhH2jMyvxk5W7ToDZPMfXBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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