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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96d6418602116750b814a5b0bf79cae6ca41c28aa477f9b1ad542a56546e162f' 
  AND token = 'RKzrpZ4Rfk9g+Orbg2rY6Y1Qn44iTZ8Ke7is54fcPug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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