SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8770b4c81c8db49aa0f9102fd619beff0c8b2bb3d2f3534cc2f79a9e3488f8e7' 
  AND token = 'i2BKz9Us0Qr7iI50J2sHPRFULVs/nK3rPjRZf+86K3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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