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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f31e686213b8d6c47dc409553274454af9370a20671e7951be64ceccb3ba41d' 
  AND token = 'LQejm1LvIlofepHYk983fZlqPMERFlJUQxEzsay2iTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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