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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f360c2b310d92a4e92a08749179b68e959bcb05cdc8e5e98a183c5fe8aeb9624' 
  AND token = 'LbVNXrf9ADtnXiBATb0HsIH+45x9pbmbm9GOemlGzys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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