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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47a626dc70837d62bec1ef6b891e535057efe743b304e3de61e4f8fcd4bcbb71' 
  AND token = 'a8HR5UlPeBVop58YhDUOrU8ndImItzno4XEokNxuZjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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