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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eedcd3ae045e4524ae881474f77c14e953b4cb5623a9943f63aee1caa343bac9' 
  AND token = '9CzRFdQHM7kUdmsnyIUI60HdbbRp6aqKv39LsPKp8fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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