SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba077adb2995d3f911b19b0d132775f4830b5d4a2033b79d0149393b3c7198f6' 
  AND token = 'Q2i6sSBLx2ce0E/tKonD3cB6s0F2zGIUGZ+VeMqGhew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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