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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0f4f7f360daf069e2835ad7ef6e6d0f9393397de2e66a6d4e76c4868dd9d8bf' 
  AND token = 'ghcPbJxAXtXLiw/m2Cc2Rx+TgTeoUXPAeHFJqVOSQCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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