SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dfb5b3a8afdd68b416179bdc06c82fdeca8c79c21127ef57205ef4ef5f3afc1' 
  AND token = 'xmWQm3DCGuhwG5RIcof4PO/iVZepOD9l4RyhjJAnGQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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