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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23ee57b7ba5439b06b0a88abe4f2559f33a75b75fe1561df5cb416332b2f0f54' 
  AND token = 'U1H3vtXJPcxkfLC30/LX6Ws0QB+API+3FBY3ba86CV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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