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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25aece852076176caa69db4a61a8232c206af5b08490d7f197596476cc434537' 
  AND token = 'nwuXCi8qsRLQv9PalyysVz5B52ef9JuiNMgzERD6pHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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