SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae23b874465d00fdc165d441cd8c2314c2242decb34689d4d20293e09c8e9970' 
  AND token = 'uCGVSAhOpgOZ7YLsFbApFwJaMMFvgjx2z0IJi13mEpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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