SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10f792dcebdcbf2a4181a0a44e23be48613aa372addce70cc4cac630ea41356f' 
  AND token = 'P6VG7lwBiEW4+P93CLEyZmsJe/czfkKuvtA1R58VM/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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