SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ef6f558b50674640a861f6b22e1ecffafd2197e0e4f7abae4f208eb59b5e5cf' 
  AND token = 'uFzFQgpGZ1YCRqrhEN08+0K7sxjx43UtCSNzOLLsywM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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