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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bee208081f51b0a6142c8423b9eb8f79a98b7d65a0fe7d787c9d82955c808591' 
  AND token = 'tTIcpeyK/sQqewCsDy5ic+0IaSrOw47Segx4UtU/lys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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