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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9db2fceb632d03f18623aee2a567c7839028fd45f85ee231b1106ae335fb593c' 
  AND token = 'aeeQS9D/JdVo2knJuGEc4joWjQyXURZkaoymvSkqs0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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