SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09617857dd0b631497c56118672cf803f26529bacc76fef1a48dd55a5bbe7cee' 
  AND token = 'fSp24/N3WSXAvfajhxZvdeT+JRoj1YPOkEDS0rbqZJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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