SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2620b44fb3de076b32605c118c35da56b1a04dc6406bfd7d5b927367b7572b9c' 
  AND token = 'aqkseUIoWvrUvVhbyHEAzbeXFiL81xhuwomvfYehjVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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