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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b504dbd2df162fa52271c5ebd745bedccc5dfff4ab18c745d95fc2b3bb027569' 
  AND token = 'dzqO2efrJaRYCn2r6il/nqgdaArBOAfP6/oH7FvKayI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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