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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dd5d705b08ce4a95ebf120d5cdb8f5b069240390df2cff56e16d784405d55dd' 
  AND token = 'KFCp6Jv/ACRJoQeIOl8LMc96B68VQVU6+deBDpxIcFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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