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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '578976c9ac47d60e77d69cfaf2666c6460dc7fcec1b6c17a2afe33c8ee3ea3f0' 
  AND token = '8NYLsOx/fmhg7foCGCt/fjIM8x5r2UcCrF6YkCl6F/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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