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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ecbfb8464b31f15252aa61bb777d256291b54f609c625539424c8e0784f8450e' 
  AND token = 'Q9waFI9ft1N+9p1DMVvtkF/CJ0BbBqAN49nX75KCNXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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