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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9974c3ea9f5a8a17bb1d2df2bddc7ec84b893ee781dde3287fefe3f9cf6deee0' 
  AND token = 'fpc7AFnu7/1z4xHHbbQ2hd3sJaY+lmaeLLrcoRaPxkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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