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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb60d61dc4aebb5e69e46938300a09492389f46189f7139f889dda15bf16fa6e' 
  AND token = 'axgiK1rl/sQL8lVaqHcjvzEooY5LYY5b8im0fsSwRBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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