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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63824399f0cfd38ae642b08e4f50fd794ceeec7bdf3c7273a2f5247664926b65' 
  AND token = 'bZ+Ev95fzA+I4W4HcHbitSunWauwngJLOy7A+W58gMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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