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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9688f25f7de32f0f27532338ac6eb2e9f3c06c33a945e2ecda4341baef0c7e3d' 
  AND token = 'qwf1WLoAxUzxQIxaTDL2qKkS5I509uCqXSfA6ct5QhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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