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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04217503edc60f1119b57e0585f5e1e911925a9622d7fc5af7c701be22450169' 
  AND token = '/XEEleA7wYpQtTUClJp839UdIv4KYZ1ROcIUvPW4Rpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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