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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71b37f7eef0b61550700497716d1f04c5f0cedc57b44980c0f8d6b6e2abcb714' 
  AND token = 'xpdJcqifiVMDZnY/3IbR9edKVW+AMY2N0S58fm7weSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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